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concentrator units (DCUs) to provide the flight crew with a visual indication of icing
conditions.
The ice detector probes vibrate at high frequency. When icing conditions are
encountered, ice accumulation on the probe causes a frequency change in the probe.
The microprocessor detects the frequency change, triggers an ICE advisory or caution
EICAS message on the EICAS and begins the probe’s deicing cycle. During probe
deicing, the probe is electrically heated for 5 seconds followed by 55 seconds with no
heat. The cycle repeats automatically as long as a frequency change is detected. When
no ice accumulation is detected, the heat cycle ceases and the ICE message on the
EICAS is removed.
Ice Detection Test
Selecting the TEST switch on the ANTI-ICE Panel to the DET position checks the
circuitry of the ice detectors.
P604_14_007
ICE AND RAIN PROTECTION
For Training Purposes Only
May 03
14-13
P I LOT T R A I N I N G GU I D E
Controls and Indicators
The ANTI-ICE Panel provides the system control switches and switch/lights, and the
EICAS Primary and Secondary displays provide the system warning/caution and
advisory messages respectively (see Figure 14-7, Tables 14-1 and 14-2).
ANTI-ICE Panel
ANTI-ICE Panel
Figure 14-7
OFF
ON
OFF
ON
ANTI-ICE
STBY
OFF
NORM
LOW LOW
OFF/
RESET
HI HI
WING COWL
L R R
R
L
L
WSHLD/WIND PROBES
TEST
L HEAT
R HEAT
ON
TEST
DET
WING
ON
OFF/
RESET
D
W
WING ANTI-ICE Switch
STBY
OFF
NORM
– Wing anti-ice valves cycle
open and closed at a predetermined
temperature (49°C /120 F open,
82°C/180 F closed).
– Wing anti-ice valves close.
– Wing anti-ice
(88°C /190 F).
°
°
controller
modulates wing anti-ice valves to
maintain a constant wing leading
edge temperature °
Wing HEAT Lights
Illuminated – Indicates
sufficient heat on respective
wing for anti-icing.
DET/WING TEST Switch
(spring-loaded to center
position)
DET
WING
– Initiates test of the
ice detectors.
– Initiates test of the
wing anti-ice controller and
overheat sensors.
L and R COWL ANTI-ICE
Switch/Light (alternate-action)
Push
Illuminated
– Opens or closes respective
cowl anti-ice valve.
– Indicates respective
cowl anti-ice valve is open with
sufficient pressure for cowl anti-icing.
L and R WSHLD/WIND Switch
OFF/RESET
LOW
HI
– Removes heat from windshields and
the side window and resets corresponding overheat circuit.
– Heats windshield and side window at a low
temperature (41°C/106°F).
– Heats windshield at a high temperature
(58°C/137°F) and side window at a low temperature (41°C/106°F).
corresponding
corresponding
corresponding
WSHLD/WIND
TEST Switch
(momentary-action)
Push
HI
– Initiates self-test of
windshield and window
heat system.
: Both L and R
WSHLD/WIND switches
must be at the position
for a complete test.
NOTE
L and R PROBES Switch
OFF
ON
– Removes heat from respective
side probes and sensors.
– Respective side probes and
sensors are heated.
: Heat is applied to probes and
sensors only if the PAX door is locked
or at least one engine generator is
selected ON.
NOTE
P604_14_008
ICE AND RAIN PROTECTION
14-14 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
EICAS Messages
EICAS Messages (1 of 2)
Table 14-1
EICAS Messages - Wing Anti-Ice System
MESSAGE MEANING AURAL WARNING
(IF ANY)
ANTI-ICE DUCT Bleed air leak detected in left and/or right fuselage or
wing anti-ice ducts. “ANTI-ICE DUCT”
WING OVHT Overheat condition detected in left and/or right wing
leading edge. “WING OVERHEAT”
L WING A/ICE With wing anti-ice selected on, insufficient pressure and temperature in
R WING A/ICE respective wing leading edge for anti-icing.
WING A/ICE SNSR Wing anti-ice sensor failure detected (control and/or overheat sensor).
WING A/ICE ON Wing anti-ice is selected on with sufficient heat available for anti-icing.
WING/COWL A/ICE ON Wing and cowl anti-ice selected on and sufficient heat/pressure available for antiicing.
WING A/ICE OK Successful test of the wing anti-ice system.
　
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